/*

<This Java Class is part of the jMusic API version 1.5, March 2004.>

Copyright (C) 2000 Andrew Sorensen & Andrew Brown

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or any
later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

package jm.audio.synth;

import jm.audio.AOException;
import jm.audio.AudioObject;

/**
 * Sums any number of inputs.
 *
 * @author Andrew Sorensen
 * @version 1.0, Sun Feb 25 18:42:46  2001
 */

public final class Add extends AudioObject {
    //----------------------------------------------
    // Constructors
    //----------------------------------------------

    /**
     * This constructor takes any number of AudioObjects
     * as input expecting each of them to be passing
     * in sample data to be summed before output.
     *
     * @param ao any number of Audio Objects.
     */
    public Add(AudioObject[] ao) {
        super(ao, "[Add]");
    }

    //----------------------------------------------
    // Methods
    //----------------------------------------------

    /**
     * This nextWork method adds all inputs together
     * and passes on a normalised result of the
     * sum.
     *
     * @param input any number of incoming samples
     */
    public int work(float[] buffer) throws AOException {
        float[][] buf = new float[this.inputs][];
        buf[0] = new float[buffer.length];
        int returned = this.previous[0].nextWork(buf[0]);
        for (int i = 1; i < inputs; i++) {
            buf[i] = new float[returned];
            if (returned != this.previous[i].nextWork(buf[i])) {
                throw new AOException(this.name, 0);
            }
        }
        int ret = 0;
        for (; ret < returned; ret++) {
            for (int j = 0; j < inputs; j++) {
                buffer[ret] += buf[j][ret];
            }
        }
        return ret;
    }
}
